Ellis R. Lippincott

The vibrational spectra and structure of ferrocene and ruthenocene

Abstract The infrared and Raman spectra of ferrocene, ferrocene- d -10 and ruthenocene are reported. The observed spectra were found to be consistent with the D 5 d model proposed for the bis cyclo pentadienyl metal compounds. A detailed assignment of frequencies to the fundamental modes of vibration has been made for these compounds. A normal co-ordinate analysis has been carried out using the vibrational assignment for a ferrocene cyclo pentadienyl ring. The similarity of the valence force symmetry constants between benzene, tropylium ion and the cyclo pentadienyl ring has confirmed the aromatic nature of the C 5 H 5 ferrocene rings.